Shoe-sewing machine



T. H. SEELY.

SHOE SEWING MACHINE. APPLICATION mp0 05c 22, I916.

Patented Oct. 19, 1920.

2 SHEETSSHEET I.

T. H. SEELY.

SHOE SEWING MACHINE.

APPLICATION FILED DEC. 22. 1916.

1,355,856 I Patented Oct. 19, 1920.

2 SHEETS-SHEET 2.

2 UNITED STATES PATENT, OFFICE,

THOMAS H. sEELY, oE ALD N; MASSACHUSETTS, ASSIGNOR, BYTVIIESNIEZ Assig MENTS, TO UNITED SHOE MACHINERY CORPORATION, OF rA'rERsomNEw JER- V s Y, A ooRroReTIoN OF NEW JERs j SHOE-SEWING MACHINE} To all whom it may concern: v V

Be it known that I, THOMAS H. SEELY, a citizen of the United .States, residing at Malden, in the county of Middlesex and State ofMassachusetts, have invented cer tain new and useful Improvements in Shoe- Sewing Machines; and I do hereby declare the following to be a full, clear, a nd exact description of the inventiom'such aswill en able others skilled in the art to which it appertains to make and use the same.

Thisinvention relates to wax threadshoe sewing machines of the class employinga curved hook needle and a looper, and more particularly to looper heating devices for such machines,

The looper employed'in this class of machine has a compound movement imparted thereto to carry the thread about the needle,

and this necessitates mounting the looper so 7 that it may be actuated in two different planes. In suchmachines it is desirable to keep the thread hot up to the time that it is incorporated in the seam, so that the wax with which the .threadis impregnated will then be in proper condition for the formation of a satisfactory tight seam. The looper should therefore be kept at a fairly high temperature, so that the thread will not become chilled as it passes along the looper arm or shank and through the eye of the looper, and will reach the work in proper condition forthev formation of the seam. On account of the manner in which the looper must be mounted in order to enable the proper movements to be imparted thereto, it has been a diflicult matter inlmachines of this class to heat the looper in a satisfactorymanner. I

The objects of the present invention are to improve the construction and mode of operation of looper heating mechanisms for wax thread curved hook needle shoe sewing machines, and to provide for such machines, novel looper heating mechanism which will maintain the looper at a substantially uniform high temperature in. a reliable manner. v

\ With this object in view, the invention consists in the novel and improved constructions, arrangements and combinations of parts hereinafter described and particularly Specification of Letters Patent. I y t ht o t 19, 2 Application filed Dame, 1916.: seri l 7N0. 138,399: f v

pointed out in the claims, the advantages of which will be appreciated by those skilled intheart. ,1 U f The features of the invention'will be readily understood from the accompanying drawings illustrating ,a machine embodying the invention in its preferred form, and the following detailed description of the construction therein shown. a 1

In. the drawings, Figure 1 is a view in side elevation of, the forward portion of the head of an inseam shoe sewing machine embodying the invention; Fig.2 is a detail view in side elevation illustrating articularly the looper heating mechanism 0 the machine; Fig. 3

is a detail view of the mechanism illustrated in Fig. 2, lookingin the direction of the arrow, Fig. 2; and F ig. 4: is a detail sectional view taken substantially on the line 4.-4 of Fig. 2.

The invention as illustrated in the draw-' ings is embodied in a wax thread curved hook needle sewing machine forv sewing inseams of boots and shoes. This machine comprises a curved hook needle 2, an awl or feed point 4, a looper 6, a thread finger 8, a welt guide 10, and a back rest 12. With the exception of the looper, all of the above i The looper is secured by means of a set.

screw 14in a socket in a. lever 16 pivoted upon a shaft 18 mounted in a bracket 20 secured to the forward end of the looper actuating slide 22, and extending downwardly from the slide toward the sewing point, as clearly shown in the drawings. Forward and rearward movements in a plane parallel with the plane of the needle are imparted to the looper by the reciprocation of the slide 22, and movements are imparted to the looper in a plane perpendicular to the plane of the needle by the oscillation of the looper lever 16 on" the shaft 18, these movements occurring in proper timed relation to each other'to carry the looper aboutthe needle. Upon the rear end of the slide 22 is mounted a can roll 24 which engages in a cam groove in a cam disk attached to the main shaft 26 cam groove on the roll 24 reciprocatory movements areimparted tothe slide.

The mechanism for oscillating the looper lever comprises a rock shaft 28, and arm 30 mounted on the forward end of the rock shaft, and a link 32 connecting the arm 30 with the looper lever. Upon the rear end of the rock shaft 28 is mounted an arm 34 carrying a cam roll 36 engaging a cam groove in a cam disk'moun'ted on the main shaft 26 of the machine. By the'action of the cam groove on the cam roll 36 through the connection described the looper lever is oscillated on the shaft 18 in timed relation to the forward'and rearward movements thereof impartedby the slide 22 torgive the proper movements to the looper.

Theslide 22 contacts at its lower'edge or face with a wear plate'or gib 38. This wear plate rests upon the upper ends "of abutment screws 40 threaded into the frame; The wear plate may be adjusted vertically to take up wear by a suitable adjustment of the abutment screws 40. It will benoted that a vertical adjustment of the wear p'late'will also result in a vertical adjustment of slide 22.

The'bracket 20 extends downwardly from the forward end of the slide 22, and is formed with a seat 42 to receive the looper heater. The looper heater consists of a block 44 mounted on the forwardly project ing frame plate 46, and shapedto fit the seat 42 on the bracket 20. The plane portions of the engaging surfaces of the heating block and the bracket 20, and the elements of the curved portions of these surfaces are sub- 7 stantially parallel with the direction of reciprocation of the slide 22, so that the heating block does not interfere with the reciprocation of the bracket 20 with the slide 22,

and there is no tendency of the bracket to' move out of contact with the heating block during the movements of the slide. The seat for the heating block is so formed as to I furnish a comparatively large area of surface contact between the heating block and the bracket for the transmission of heat from the block to the bracket. As shown in the drawings, the bracket 20 contacts with the heating block at the side thereof, and is curved aboutthe lower end of the block.

The heating block 44 is mounted between the parallel guides 48 on the frame plate 46. These guidesare arranged substantially pebpendicular to the guideway for the slide, so that the block can move between the guides in a direction substantially perpendicular to the direction of movement of the slide. The block is held yieldingly in engagement with the bracket 20 by means of a coiled spring 50 seated at its upper end in a recess in a projection 52 on the frame plate 46', and at its lower end in a suitable bore in the heatthe ing block. By means this'springafgood .heatfconducting contact is maintained be tween the heating block and the bracket 20 during the reciprocation ofthe bracket'with the slide 22. r

The heat transmitted from the heating block 44 to the bracket 20 will heat the bracket to and maintain the'same at a comparatively high temperature. In order that the heat may be transmitted rapidly and efiilooper mountedthereom the bracket20 is ciently to the looper lever 16 andto. the".

formed with parallel flanges. or ribs54 be" tween which the looper lever 18 ismounted. I The ribs 54 are spaced and the looperlever' is constructed so that'the lever fits; closely between the ribs. .The lever there fore dur- 18, will be in contact orsubstantially in con This construction furnishes a comparatively large 'area'of contact between'the ribs and the lever-for transmit? ingits oscillatory jmovements onjthe "shaft tingheatfrom the bracket 20 to the lever. I

It will be noted that with this arrangement of the heating block-relative'to the bracket 20 and the looper lever, the heating block contacts with the bracket 20 close to the engaging surfaces of the bracket and the looper lever, and that'the heating block'is located close to thelooper itself, so that heat is transmitted by conduction rapidly and with little loss from the heating block to the looper. By the heat transmitted from the heating block 44 through the bracket 20 to the looper lever 16 and to the looper mounted thereon, the looper will be kept at a comparatively high temperature in a reli- V able manner during the sewing operation.

The heating block 44 may be heated in any suitable manner or by any suitable heating medium. In the construction illustrated in the drawings the heating block is arranged to be heated by steam. To this end the block is formed with a steam chamber'56 which is supplied with steam through .an inlet pipe 58. The forward end of theinlet' pipe is connected with the steam chamber by means of a short pipe section 60 threaded into the block 44, and a union 62 connecting the forward end of the inlet pipe with the pipe section 60. The rear end of the: inlet pipe is connected with a bore or passageway 64 in the frame, adapted to be connected 7 with the source of steamsupply. The steam passes from the steam chamber 56 through an outlet pipe 67 connected at its forward end with the chamber 56 and extending from the heating block 40 toward the rear of the machine.

The present machine is also provided with devices for severing the thread bethread cutting knife is formed upon one tween the shoe and themachine after the completion of a seam and for holding the severed end of the thread projectin from the thread handling devices during t e first part of the formation of the next seam. The devices for severing and holding the thread comprise a thread cutting knife 68 and a thread gripping device 70. The

arm of a thin steel plate bent 'at an acute angle, as shown in Figs. 1 and 2, and secured by means of a screw 72 to the forward face of the forward rib 54 on the bracket 20. The thread gripping device consists of two cooperatingthread gripping jaws 74 and 76 adapted to yieldingly grip the thread placed between them. he thread gripping jaw 74 is formed upon a cylindrical block 77 secured to a rod 78 having two arms bent substantially at right angles to each other, one of which is secured in a split clamp 80 formed on the looper lever 16 and actuated by a clamping screw 82. The jaw 76 of the thread gripping device is formed at the end of one arm 0]": a U-shaped spring plate 84, the other arm of which is secured to the cylindrical block 77. To prevent the thread, when it is drawn between the thread gripping jaws, from passing beyond the jaws into the loop in the spring plate 84, two lateral projections 86 formed upon the block 77 extend from the block across the plane of the contacting faces of the thread gripping jaws so as to form stops for the thread. i

It will be noted that the thread gripping jaws are spaced from the looper lever 16 and are connected therewith merely by the rod 78 through which heat is transmitted by conduction from the lever to the grip the heat transmitted by conduction from the lever 18 to the gripping jaws by the I the looper heater.

longitudinal adjustment of the arm of the rod 78 which is engaged in a clamp 80.

Certain features of the thread gripping and severing devices described above are covered by a divisional application, Serial No. 291,294, filed April 19, 1919. Having explained the nature and object of the invention and having specifically described a machine embodying the same in its preferred form, what is claimed is 1. A wax thread shoe sewing machine, having, in combination, stitch forming devices including a curved hook needle, 2. looper, a looper actuating slide, a bracket secured to the slide, a looper lever pivoted on the bracket, and a looper heater fixed in the direction of movement of the slide and having a heat conducting contact with the bracket for heating the looper lever and the looper through the bracket.

2. A wax thread shoe sewing machine, having, incombination, stitch formin devices including a curved hook need e, a looper, a looper actuating slide, a bracket attached to the slide, a looper lever pivoted on the bracket, a looper heater mounted for movement in a direction transverse to the direction of movement of the bracket and having a yielding heat conducting contact with the bracket and devices for guiding 3. A wax thread shOe sewing machine, having, in combination, stitch forming de vices including a curved hook needle, 3. looper, a looper actuating slide, a bracket secured to the slide and having parallel having parallel spaced ribs secured to theforward end of the slide, a looper lever pivoted on the bracket'between the ribs and contacting therewith, a rock shaft, an arm thereon, a link for connecting the arm with the looper lever arranged between and held in place by the ribs, and a looper heater engaging the bracket for heating the looper lever and looper throu h the bracket.

THO AS- H. SEELY. 

